44 
The American Geologist. jniy, 1901. 
NaL-0 0.81 0.20 
K2O 0.19 2.71 
HoOatllO^'C 2.44 0.23 (hygroscopic.) 
H2O above 110° C 5.65 7.00 (combined). 
TiOs 0.65 
I'oOr, 0.06 
MnO trace 
BaO •• 04 
SrO trace 
U2O 0.03 
SO3 0.02 
CI trace 
COo 0.83 
CarboH.-iceous matter 0.32 
Total 100.54 99.67 ^ 
The Connasauga shales (Cambrian) are Ijeheved therefore 
to have been the source of the material. 
(2) The Means of Transportation : The formations of the 
district, both limestone and shale, are intersected by numerous 
faults, which afforded in the past easy access for the percola- 
tion of waters. The descending waters carrying oxygen in so- 
lution reacted chemically on the aluminovis shales, which con- 
tained disseminated pyrites, taking into solution the sulphates 
of aluminum and iron, which salts were returned to the surface 
1)}' the ascending waters. The upward passage of these salts 
in contact with several thousand feet of limestone resulted in 
a further chemical reaction, forming probably, as in the chem- 
ical laboratory, aluminum hydroxide and basic sulphate of 
aluminiim. 
(3) The Process of AcciiinuJation: The ascending cur- 
rents bearing the aluminous salts in solution are believed to have 
reached the surface near or upon the fault lines forming large 
springs, which were probably themial, and the aluminum hy- 
droxide produced as described by Hayes formed a gelatinous 
precipitate, which collected about the vents of the springs. 
"From analogy with pisolitic sinter and travertine now form- 
ing such conditions would appear to be highly favorable for the 
production of the structure actuallv found in the bauxite. The 
precipitate was apparently collected in globular masses h\ the 
motion of the ascending water, and constant changes in position 
permitted these to be coated with successive layers of more 
compact material. Finally after having received many such 
